No they should release each DLC when it's done, not at arbitrary release dates.
I think DoD got more development time before their first DD they will show 2 more focus trees, convertable equipment (next week), a further AI devblog, and at least one devblog for new air force mechanics. I' d say early june.If it take them as long as it was for TfV it will be mid to end Juli (they had 16 dev diaries, so it would be 12 more weeks)